<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>角色管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片区域 -->
    <el-card>
      <!-- 添加角色按钮区域 -->
      <el-row>
        <el-col>
          <el-button type="primary" @click="setAddRoleDialogVisible = true">添加角色</el-button>
        </el-col>
      </el-row>
       <!-- 角色列表区域 -->
        <el-table :data="roleList" border stripe>
          <!-- 展开列 -->
          <el-table-column type="expand">
            <template slot-scope="scope">
              <el-row
                :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']"
                v-for="(item1, i1) in scope.row.children"
                :key="item1.id"
              >
                <!-- 渲染一级权限 -->
                <el-col :span="5">
                  <el-tag
                    closable
                    @close="removeRightById(scope.row, item1.id)"
                    >{{ item1.authName }}</el-tag
                  >
                  <i class="el-icon-caret-right"></i>
                </el-col>
                <!-- 渲染二级和三级权限 -->
                <el-col :span="19">
                  <el-row
                    :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']"
                    v-for="(item2, i2) in item1.children"
                    :key="item2.id"
                  >
                    <el-col :span="6">
                      <el-tag
                        type="success"
                        closable
                        @close="removeRightById(scope.row, item2.id)"
                        >{{ item2.authName }}</el-tag
                      >
                      <i class="el-icon-caret-right"></i>
                    </el-col>
                    <el-col :span="18">
                      <el-tag
                        :class="[i3 === 0 ? '' : 'bdtop']"
                        type="warning"
                        v-for="(item3, i3) in item2.children"
                        :key="item3.id"
                        closable
                        @close="removeRightById(scope.row, item3.id)"
                      >
                        {{ item3.authName }}
                      </el-tag>
                    </el-col>
                  </el-row>
                </el-col>
              </el-row>
            </template>
          </el-table-column>
          <!-- 索引列 -->
          <el-table-column type="index" label="#"></el-table-column>
          <el-table-column label="角色名称" prop="roleName"></el-table-column>
          <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
          <el-table-column label="操作" width="300px">
            <template slot-scope="scope">
              <el-button
                size="mini"
                type="primary"
                icon="el-icon-edit"
                @click="showEditDialog(scope.row.id)">
                编辑
              </el-button>
              <el-button
                size="mini"
                type="danger"
                icon="el-icon-delete"
                @click="removeUserById(scope.row.id)">
                删除
              </el-button>
              <el-button
                size="mini"
                type="warning"
                icon="el-icon-setting"
                @click="showSetRightDialog(scope.row)">
                分配权限
                </el-button>
            </template>
          </el-table-column>
        </el-table>
    </el-card>

    <!-- 分配权限的对话框 -->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%"
      @close="setRightDialogClosed"
    >
      <!-- 树形控件 -->
      <el-tree
        :data="rightsList"
        :props="treeProps"
        show-checkbox
        node-key="id"
        default-expand-all
        :default-checked-keys="defKeys"
        ref="treeRef"
      >
      </el-tree>

      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 添加角色对话框 -->
    <el-dialog
      title="添加角色"
      :visible.sync="setAddRoleDialogVisible"
      width="50%"
      @close="addDialogClosed">
      <!-- 表单区域 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="80px">
        <el-form-item label="角色名称" prop="roleName">
          <el-input v-model="addForm.roleName"></el-input>
        </el-form-item>
        <el-form-item label="角色描述" prop="roleDesc">
          <el-input v-model="addForm.roleDesc"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setAddRoleDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addRole"
          >确 定</el-button
        >
      </span>
    </el-dialog>
    <!-- 编辑角色对话框 -->
    <el-dialog
      title="添加角色"
      :visible.sync="editRoleDialogVisible"
      width="50%"
      @close="editDialogClosed">
      <!-- 表单区域 -->
      <el-form
        :model="editForm"
        :rules="addFormRules"
        ref="editFormRef"
        label-width="80px">
        <el-form-item label="角色名称" prop="roleName">
          <el-input v-model="editForm.roleName"></el-input>
        </el-form-item>
        <el-form-item label="角色描述" prop="roleDesc">
          <el-input v-model="editForm.roleDesc"></el-input>
        </el-form-item>
      </el-form>
      <!-- 底部按钮区域 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="editRoleDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editRoleInfo"
          >确 定</el-button
        >
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 所有角色列表数据
      roleList: [],
      // 控制分配权限对话框的显示与隐藏
      setRightDialogVisible: false,
      // 选中角色所有权限数据
      rightsList: [],
      // 树形控件的属性绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 树形控件默认选中的节点Id值数组
      defKeys: [],
      // 当前即将分配角色的角色 id
      roleId: '',
      // 控制添加角色对话框的显示与隐藏
      setAddRoleDialogVisible: false,
      // 添加用户的表单数据
      addForm: {
        roleName: '',
        roleDesc: ''
      },
      // 添加和编辑角色表单的验证规则对象
      addFormRules: {
        roleName: [
          { required: true, message: '请输入角色名称', trigger: 'blur' },
          { min: 2, max: 10, message: '角色名称的长度在 2 到 10 个字符之间', trigger: 'blur' }
        ],
        roleDesc: [
          { max: 100, message: '用户描述的长度小于100 个字符', trigger: 'blur' }
        ]
      },
      // 编辑角色的表单数据
      editForm: {
        roleId: '',
        roleName: '',
        roleDesc: ''
      },
      // 控制编辑角色对话框的显示与隐藏
      editRoleDialogVisible: false
    }
  },
  created() {
    this.getRolesList()
  },
  methods: {
    // 获取所有角色的列表
    async getRolesList() {
      const { data: res } = await this.$http.get('roles')

      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败！')
      }

      this.roleList = res.data
    },
    // 根据 id 删除对应的权限
    async removeRightById(role, rightId) {
      // 询问用户是否删除
      const confirmResult = await this.$confirm(
        '此操作将永久删除该权限, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch((err) => err)

      if (confirmResult !== 'confirm') {
        return this.$message.info('取消了删除')
      }

      // 发起删除权限网络请求
      const { data: res } = await this.$http.delete(
        `roles/${role.id}/rights/${rightId}`
      )

      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败！')
      }

      // this.getRolesList() // 导致列表重新刷新
      // 删除成功后台返回最新的权限信息
      role.children = res.data
    },
    // 展示分配权限的对话框
    async showSetRightDialog(role) {
      // 保存当前角色的 id
      this.roleId = role.id
      // 获取所有权限的数据
      const { data: res } = await this.$http.get('rights/tree')

      if (res.meta.status !== 200) {
        return this.$message.error('获取权限数据失败！')
      }

      this.rightsList = res.data

      // 递归获取当前角色的所有三级权限节点Id
      this.getLeafKeys(role, this.defKeys)
      console.log(this.defKeys)

      this.setRightDialogVisible = true
    },
    // 通过递归的形式，获取角色下所有三级权限的id,并保存到 defKeys 数组中
    getLeafKeys(node, arr) {
      // 没有字节点即为三级节点，保存该节点并返回
      if (!node.children) {
        return arr.push(node.id)
      }
      // 非三级节点，继续递归子节点
      node.children.forEach((item) => {
        this.getLeafKeys(item, arr)
      })
    },
    // 监听分配权限对话框的关闭
    setRightDialogClosed() {
      this.defKeys = []
    },
    // 点击为角色分配权限
    async allotRights() {
      const keys = [
        ...this.$refs.treeRef.getHalfCheckedKeys(),
        ...this.$refs.treeRef.getCheckedKeys()
      ]

      // 生成以逗号分割的字符串
      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(
        `roles/${this.roleId}/rights`,
        { rids: idStr }
      )

      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败！')
      }

      this.$message.success('分配权限成功！')
      this.getRolesList()
      this.setRightDialogVisible = false
    },
    // 点击田添加角色
    async addRole() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return

        const { data: res } = await this.$http.post('roles', this.addForm)

        if (res.meta.status !== 201) {
          return this.$message.error('添加角色失败！')
        }

        this.$message.success('添加角色成功！')
        this.setAddRoleDialogVisible = false
        this.getRolesList()
      })
    },
    // 监听新增角色对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 展示编辑角色的对话框
    async showEditDialog(id) {
      const { data: res } = await this.$http.get('roles/' + id)

      if (res.meta.status !== 200) {
        return this.$message.error('获取角色信息失败！')
      }

      this.editForm = res.data
      this.editRoleDialogVisible = true
    },
    // 点击按钮，修改角色信息并提交
    async editRoleInfo() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put('roles/' + this.editForm.roleId, { roleName: this.editForm.roleName, roleDesc: this.editForm.roleDesc })

        if (res.meta.status !== 200) {
          return this.$message.error('修改角色信息失败！')
        }

        this.editRoleDialogVisible = false
        this.getRolesList()
        this.$message.success('修改角色信息成功！')
      })
    },
    // 监听编辑角色对话框的关闭事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 根据角色 id 删除角色信息
    async removeUserById(id) {
      // 询问
      const confirmResult = await this.$confirm('此操作将永久删除该用户, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)

      if (confirmResult !== 'confirm') {
        return this.$message.info('已经取消删除！')
      }

      const { data: res } = await this.$http.delete('roles/' + id)

      if (res.meta.status !== 200) {
        return this.$message.error('删除角色失败！')
      }

      this.$message.success('删除角色成功！')
      this.getRolesList()
    }
  }
}
</script>

<style>
.el-tag {
  margin: 7px;
}

.bdtop {
  border-top: 1px solid #eee;
}

.bdbottom {
  border-bottom: 1px solid #eee;
}

.vcenter {
  display: flex;
  align-items: center;
}
</style>
